- 期刊
評估16、64與256偵檢器電腦斷層(MDCT)冠狀動脈掃描造成病人之有效劑量
Comparison of Effective Doses on Undergoing Cardiac Imaging between 16-, 64- and 256-Multislice CT Scanners
摘要
電腦斷層掃描（Computed Tomography, 簡稱CT）自1972年發展至今，是目前臨床診斷上不可或缺的角色。近年，隨著國人飲食習慣越來越西化，根據衛生署1998年資料中統計，心臟疾病已排在國人死因第二名，也因此越來越多人重視自己的健康。近年來，隨著電腦斷層技術的日益進步，多偵檢器電腦斷層掃描儀(Multi-detector Computer Tomography, MDCT)亦可用來早期評估冠狀動脈狹窄的情形；由於爲非侵入性檢查，因此國人接受心臟冠狀動脈檢查人次也越來越多，而對於受檢者的劑量貢獻也越來越值得關注。本研究測量工具主要利用熱發光劑量計(Thermoluminescent dosimeter, TLD)，其TLD型號爲GR-200 (LiF: Mg, Cu, P ) 及GR-200F (LiF: Mg, Cu, P)，將TLD佈點於Rando假體內，以國際輻射防護委員會(International Commission on Radiological Protection, ICRP)報告所列出之輻射敏感器官作爲假體佈點之重點，測量16切、64切及256切電腦斷層掃描儀於心臟冠狀動脈檢查時造成病人之有效劑量。研究顯示，16-、64-及256MDCT對於甲狀腺的吸收劑量(Absorbed does)分別爲3.56、3.66及4.69mGy，對於肺部等價劑量分別爲49.75、58.72及58.84 mGy，對於心臟等價劑量分別爲60.01、69.25及74.39 mGy，全身之等效劑量分別爲21.48、26.89及24.83 mSv。未來，多切片電腦斷層將會不斷的朝向減低病人劑量，並且得到更好的影像品質發展，以獲得最佳的診斷效果。
並列摘要
Computed tomography (CT) has developed since 1972, is an indispensable role in clinical diagnosis. In recent years, as people increasingly Westernized diet, according to 1998 data the Department of Health Statistics, heart disease, the cause of death has been ranked second in the people, should this more and more people value their health, in recent years, with the CT technology advances, the computed tomography coronary angiography (CTCA) can also be used for early assessment of coronary artery stenosis case, the non-invasive procedures, so examination times people receiving coronary artery more and more, while the radiation dose for subjects contribute more and more cause for concern. This study use thermoluminescent dosimeter (TLD) for its assessment of radiation dosage. The TLD model is GE-200 (LiF: Mg, Cu, P) and GR-200F (LiF: Mg, Cu, P). This study mainly use the standard Rando phantom for the radiation dosage exposure and used the report made by International Commission (ICRP) on Radiological Protection as the radiation sensitive organs. According to our study, the absorbed doses for the thyroid gland are 3.56、3.66 and 4.69 mGy respectively for 16, 64 and 256 MDCT. The absorbed doses for the lungs are 49.75、58.72 and 58.84 mGy respectively; for the heart is 60.01、69.25 and 74.39 mGy respectively, the effective doses is 21.48、26.89 and 24.83 mSv respectively. As the CT technology continues to advance, the patients benefit with more detailed examinations. However, how we reduce the associated radiation dosage should be our continued goal for the future.